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Appendix A System Interface Description

There are two system interfaces:

-one RS-232C serial interface

-one Parallel Centronics interface.

The interfaces can be operated in three different modes:

-serial interface active

-parallel interface active

-both interfaces active in shared mode

The following chapter gives an overview about interface characteristics, control signals, protocols, and cabling.

Any change of the operation mode (Serial, Parallel or Shared) and of the size of the interface buffer is possible only when the interface buffer is completely empty of data.

Display messages: READY 4 ELQ , BUSY 4 ELQ, or LOCAL.

Appendix A System Interface Description

1Serial Interface RS-232C

Interface Characteristics

 

 

 

 

 

 

 

 

Signal Description

 

Pin No.

Direction

 

PG

Protective Ground

 

1

-

 

 

 

 

 

 

 

TXD

Transmit Data (from printer to host)

 

2

OUTPUT

 

 

 

 

 

 

 

RXD

Receive Data (from host to printer)

 

3

INPUT

 

 

 

 

 

 

 

RTS

Request to Send (printer is ready to send data)

*)

4

OUTPUT

 

 

 

 

 

 

 

CTS

Clear to Send (host is ready to receive data)

*)

5

INPUT

 

 

 

 

 

 

 

DSR

Data Set Ready

 

6

INPUT

 

 

 

 

 

 

 

SG

Signal Ground

 

7

-

 

 

 

 

 

 

 

DTR

Data Terminal Ready (printer is ready to receive - see also on the

 

20

OUTPUT

 

 

following pages the data communication protocols for detail mean-

 

 

 

 

 

ing)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

*) with internal pull-up

-

Transmission rate:

600, 1200, 2400, 4800, 9600, or 19200 baud

-

Parity:

even, odd, none, or ignore

-

Word length:

7, or 8 bits

-Number of stop bits: In receive mode the printer accepts 1, or 2 stop bits. The printer transmits always two stop bits.

Transmission Protocols:

-DTR - Ready/Busy

-XON/XOFF

-XON/XOFF + DTR

A-1A-2

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Epson MTX 1345 manual Appendix a System Interface Description, Display messages Ready 4 ELQ , Busy 4 ELQ, or Local

MTX 1345 specifications

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